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deleted graphics module; it's a Nimble package now
This commit is contained in:
Araq
@@ -1,577 +0,0 @@
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#
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#
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# Nim's Runtime Library
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# (c) Copyright 2012 Andreas Rumpf, Dominik Picheta
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#
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# See the file "copying.txt", included in this
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# distribution, for details about the copyright.
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#
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## This module implements graphical output for Nim; the current
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## implementation uses SDL but the interface is meant to support multiple
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## backends some day. There is no need to init SDL as this module does that
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## implicitly.
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import colors, math
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from sdl import PSurface # Bug
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from sdl_ttf import openFont, closeFont
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type
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Rect* = tuple[x, y, width, height: int]
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Point* = tuple[x, y: int]
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PSurface* = ref Surface ## a surface to draw onto
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Surface* {.pure, final.} = object
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w*, h*: Natural
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s*: sdl.PSurface
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EGraphics* = object of IOError
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Font {.pure, final.} = object
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f: sdl_ttf.PFont
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color: sdl.Color
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PFont* = ref Font ## represents a font
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{.deprecated: [TSurface: Surface, TFont: Font, TRect: Rect, TPoint: Point].}
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proc toSdlColor*(c: Color): sdl.Color =
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## Convert colors.Color to sdl.Color
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var x = c.extractRGB
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result.r = x.r and 0xff
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result.g = x.g and 0xff
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result.b = x.b and 0xff
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proc createSdlColor*(sur: PSurface, c: Color, alpha: int = 0): int32 =
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## Creates a color using ``sdl.MapRGBA``.
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var x = c.extractRGB
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return sdl.mapRGBA(sur.s.format, x.r and 0xff, x.g and 0xff,
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x.b and 0xff, alpha and 0xff)
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proc toSdlRect*(r: Rect): sdl.Rect =
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## Convert ``graphics.Rect`` to ``sdl.Rect``.
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result.x = int16(r.x)
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result.y = int16(r.y)
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result.w = uint16(r.width)
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result.h = uint16(r.height)
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proc raiseEGraphics =
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raise newException(EGraphics, $sdl.getError())
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proc surfaceFinalizer(s: PSurface) = sdl.freeSurface(s.s)
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proc newSurface*(width, height: int): PSurface =
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## creates a new surface.
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new(result, surfaceFinalizer)
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result.w = width
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result.h = height
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result.s = sdl.createRGBSurface(sdl.SWSURFACE, width, height,
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32, 0x00FF0000, 0x0000FF00, 0x000000FF, 0)
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if result.s == nil:
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raiseEGraphics()
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assert(not sdl.mustLock(result.s))
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proc fontFinalizer(f: PFont) = closeFont(f.f)
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proc newFont*(name = "VeraMono.ttf", size = 9, color = colBlack): PFont =
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## Creates a new font object. Raises ``EIO`` if the font cannot be loaded.
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new(result, fontFinalizer)
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result.f = openFont(name, size.cint)
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if result.f == nil:
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raise newException(IOError, "Could not open font file: " & name)
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result.color = toSdlColor(color)
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var
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defaultFont*: PFont ## default font that is used; this needs to initialized
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## by the client!
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proc initDefaultFont*(name = "VeraMono.ttf", size = 9, color = colBlack) =
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## initializes the `defaultFont` var.
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defaultFont = newFont(name, size, color)
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proc newScreenSurface*(width, height: int): PSurface =
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## Creates a new screen surface
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new(result, surfaceFinalizer)
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result.w = width
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result.h = height
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result.s = sdl.setVideoMode(width, height, 0, 0)
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if result.s == nil:
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raiseEGraphics()
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proc writeToBMP*(sur: PSurface, filename: string) =
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## Saves the contents of the surface `sur` to the file `filename` as a
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## BMP file.
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if sdl.saveBMP(sur.s, filename) != 0:
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raise newException(IOError, "cannot write: " & filename)
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type
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Pixels = array[0..1000_000-1, int32]
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PPixels = ptr Pixels
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{.deprecated: [TPixels: Pixels].}
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template setPix(video, pitch, x, y, col: expr): stmt =
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video[y * pitch + x] = int32(col)
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template getPix(video, pitch, x, y: expr): expr =
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colors.Color(video[y * pitch + x])
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const
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ColSize = 4
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proc getPixel(sur: PSurface, x, y: Natural): colors.Color {.inline.} =
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assert x <% sur.w
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assert y <% sur.h
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result = getPix(cast[PPixels](sur.s.pixels), sur.s.pitch.int div ColSize,
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x, y)
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proc setPixel(sur: PSurface, x, y: Natural, col: colors.Color) {.inline.} =
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assert x <% sur.w
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assert y <% sur.h
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var pixs = cast[PPixels](sur.s.pixels)
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#pixs[y * (sur.s.pitch div colSize) + x] = int(col)
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setPix(pixs, sur.s.pitch.int div ColSize, x, y, col)
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proc `[]`*(sur: PSurface, p: Point): Color =
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## get pixel at position `p`. No range checking is done!
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result = getPixel(sur, p.x, p.y)
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proc `[]`*(sur: PSurface, x, y: int): Color =
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## get pixel at position ``(x, y)``. No range checking is done!
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result = getPixel(sur, x, y)
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proc `[]=`*(sur: PSurface, p: Point, col: Color) =
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## set the pixel at position `p`. No range checking is done!
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setPixel(sur, p.x, p.y, col)
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proc `[]=`*(sur: PSurface, x, y: int, col: Color) =
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## set the pixel at position ``(x, y)``. No range checking is done!
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setPixel(sur, x, y, col)
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proc blit*(destSurf: PSurface, destRect: Rect, srcSurf: PSurface,
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srcRect: Rect) =
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## Copies ``srcSurf`` into ``destSurf``
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var destTRect, srcTRect: sdl.Rect
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destTRect.x = int16(destRect.x)
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destTRect.y = int16(destRect.y)
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destTRect.w = uint16(destRect.width)
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destTRect.h = uint16(destRect.height)
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srcTRect.x = int16(srcRect.x)
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srcTRect.y = int16(srcRect.y)
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srcTRect.w = uint16(srcRect.width)
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srcTRect.h = uint16(srcRect.height)
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if sdl.blitSurface(srcSurf.s, addr(srcTRect), destSurf.s, addr(destTRect)) != 0:
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raiseEGraphics()
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proc textBounds*(text: string, font = defaultFont): tuple[width, height: int] =
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var w, h: cint
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if sdl_ttf.sizeUTF8(font.f, text, w, h) < 0: raiseEGraphics()
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result.width = int(w)
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result.height = int(h)
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proc drawText*(sur: PSurface, p: Point, text: string, font = defaultFont) =
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## Draws text with a transparent background, at location ``p`` with the given
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## font.
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var textSur: PSurface # This surface will have the text drawn on it
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new(textSur, surfaceFinalizer)
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# Render the text
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textSur.s = sdl_ttf.renderTextBlended(font.f, text, font.color)
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# Merge the text surface with sur
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sur.blit((p.x, p.y, sur.w, sur.h), textSur, (0, 0, sur.w, sur.h))
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proc drawText*(sur: PSurface, p: Point, text: string,
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bg: Color, font = defaultFont) =
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## Draws text, at location ``p`` with font ``font``. ``bg``
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## is the background color.
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var textSur: PSurface # This surface will have the text drawn on it
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new(textSur, surfaceFinalizer)
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textSur.s = sdl_ttf.renderTextShaded(font.f, text, font.color, toSdlColor(bg))
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# Merge the text surface with sur
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sur.blit((p.x, p.y, sur.w, sur.h), textSur, (0, 0, sur.w, sur.h))
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proc drawCircle*(sur: PSurface, p: Point, r: Natural, color: Color) =
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## draws a circle with center `p` and radius `r` with the given color
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## onto the surface `sur`.
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var video = cast[PPixels](sur.s.pixels)
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var pitch = sur.s.pitch.int div ColSize
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var a = 1 - r
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var py = r
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var px = 0
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var x = p.x
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var y = p.y
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while px <= py + 1:
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if x+px <% sur.w:
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if y+py <% sur.h: setPix(video, pitch, x+px, y+py, color)
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if y-py <% sur.h: setPix(video, pitch, x+px, y-py, color)
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if x-px <% sur.w:
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if y+py <% sur.h: setPix(video, pitch, x-px, y+py, color)
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if y-py <% sur.h: setPix(video, pitch, x-px, y-py, color)
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if x+py <% sur.w:
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if y+px <% sur.h: setPix(video, pitch, x+py, y+px, color)
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if y-px <% sur.h: setPix(video, pitch, x+py, y-px, color)
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if x-py <% sur.w:
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if y+px <% sur.h: setPix(video, pitch, x-py, y+px, color)
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if y-px <% sur.h: setPix(video, pitch, x-py, y-px, color)
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if a < 0:
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a = a + (2 * px + 3)
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else:
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a = a + (2 * (px - py) + 5)
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py = py - 1
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px = px + 1
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proc `>-<`(val: int, s: PSurface): int {.inline.} =
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return if val < 0: 0 elif val >= s.w: s.w-1 else: val
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proc `>|<`(val: int, s: PSurface): int {.inline.} =
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return if val < 0: 0 elif val >= s.h: s.h-1 else: val
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proc drawLine*(sur: PSurface, p1, p2: Point, color: Color) =
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## draws a line between the two points `p1` and `p2` with the given color
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## onto the surface `sur`.
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var stepx, stepy: int = 0
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var x0 = p1.x >-< sur
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var x1 = p2.x >-< sur
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var y0 = p1.y >|< sur
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var y1 = p2.y >|< sur
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var dy = y1 - y0
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var dx = x1 - x0
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if dy < 0:
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dy = -dy
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stepy = -1
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else:
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stepy = 1
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if dx < 0:
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dx = -dx
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stepx = -1
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else:
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stepx = 1
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dy = dy * 2
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dx = dx * 2
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var video = cast[PPixels](sur.s.pixels)
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var pitch = sur.s.pitch.int div ColSize
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setPix(video, pitch, x0, y0, color)
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if dx > dy:
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var fraction = dy - (dx div 2)
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while x0 != x1:
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if fraction >= 0:
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y0 = y0 + stepy
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fraction = fraction - dx
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x0 = x0 + stepx
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fraction = fraction + dy
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setPix(video, pitch, x0, y0, color)
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else:
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var fraction = dx - (dy div 2)
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while y0 != y1:
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if fraction >= 0:
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x0 = x0 + stepx
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fraction = fraction - dy
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y0 = y0 + stepy
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fraction = fraction + dx
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setPix(video, pitch, x0, y0, color)
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proc drawHorLine*(sur: PSurface, x, y, w: Natural, color: Color) =
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## draws a horizontal line from (x,y) to (x+w-1, y).
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var video = cast[PPixels](sur.s.pixels)
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var pitch = sur.s.pitch.int div ColSize
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if y >= 0 and y <= sur.s.h:
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for i in 0 .. min(sur.s.w-x, w)-1:
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setPix(video, pitch, x + i, y, color)
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proc drawVerLine*(sur: PSurface, x, y, h: Natural, color: Color) =
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## draws a vertical line from (x,y) to (x, y+h-1).
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var video = cast[PPixels](sur.s.pixels)
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var pitch = sur.s.pitch.int div ColSize
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if x >= 0 and x <= sur.s.w:
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for i in 0 .. min(sur.s.h-y, h)-1:
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setPix(video, pitch, x, y + i, color)
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proc fillCircle*(s: PSurface, p: Point, r: Natural, color: Color) =
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## draws a circle with center `p` and radius `r` with the given color
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## onto the surface `sur` and fills it.
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var a = 1 - r
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var py: int = r
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var px = 0
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var x = p.x
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var y = p.y
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while px <= py:
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# Fill up the middle half of the circle
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drawVerLine(s, x + px, y, py + 1, color)
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drawVerLine(s, x + px, y - py, py, color)
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if px != 0:
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drawVerLine(s, x - px, y, py + 1, color)
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drawVerLine(s, x - px, y - py, py, color)
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if a < 0:
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a = a + (2 * px + 3)
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else:
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a = a + (2 * (px - py) + 5)
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py = py - 1
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# Fill up the left/right half of the circle
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if py >= px:
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drawVerLine(s, x + py + 1, y, px + 1, color)
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drawVerLine(s, x + py + 1, y - px, px, color)
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drawVerLine(s, x - py - 1, y, px + 1, color)
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drawVerLine(s, x - py - 1, y - px, px, color)
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px = px + 1
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proc drawRect*(sur: PSurface, r: Rect, color: Color) =
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## draws a rectangle.
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var video = cast[PPixels](sur.s.pixels)
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var pitch = sur.s.pitch.int div ColSize
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if (r.x >= 0 and r.x <= sur.s.w) and (r.y >= 0 and r.y <= sur.s.h):
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var minW = min(sur.s.w - r.x, r.width)
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var minH = min(sur.s.h - r.y, r.height)
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# Draw Top
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for i in 0 .. minW - 1:
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setPix(video, pitch, r.x + i, r.y, color)
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setPix(video, pitch, r.x + i, r.y + minH - 1, color) # Draw bottom
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# Draw left side
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for i in 0 .. minH - 1:
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setPix(video, pitch, r.x, r.y + i, color)
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setPix(video, pitch, r.x + minW - 1, r.y + i, color) # Draw right side
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proc fillRect*(sur: PSurface, r: Rect, col: Color) =
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## Fills a rectangle using sdl's ``FillRect`` function.
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var rect = toSdlRect(r)
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if sdl.fillRect(sur.s, addr(rect), sur.createSdlColor(col)) == -1:
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raiseEGraphics()
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proc plot4EllipsePoints(sur: PSurface, cx, cy, x, y: Natural, col: Color) =
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var video = cast[PPixels](sur.s.pixels)
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var pitch = sur.s.pitch.int div ColSize
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if cx+x <= sur.s.w-1:
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if cy+y <= sur.s.h-1: setPix(video, pitch, cx+x, cy+y, col)
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if cy-y <= sur.s.h-1: setPix(video, pitch, cx+x, cy-y, col)
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if cx-x <= sur.s.w-1:
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if cy+y <= sur.s.h-1: setPix(video, pitch, cx-x, cy+y, col)
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if cy-y <= sur.s.h-1: setPix(video, pitch, cx-x, cy-y, col)
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proc drawEllipse*(sur: PSurface, cx, cy, xRadius, yRadius: Natural,
|
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col: Color) =
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## Draws an ellipse, ``CX`` and ``CY`` specify the center X and Y of the
|
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## ellipse, ``XRadius`` and ``YRadius`` specify half the width and height
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## of the ellipse.
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var
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x, y: Natural
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xChange, yChange: int
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ellipseError: Natural
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twoASquare, twoBSquare: Natural
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stoppingX, stoppingY: Natural
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twoASquare = 2 * xRadius * xRadius
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twoBSquare = 2 * yRadius * yRadius
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x = xRadius
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y = 0
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xChange = yRadius * yRadius * (1 - 2 * xRadius)
|
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yChange = xRadius * xRadius
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ellipseError = 0
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stoppingX = twoBSquare * xRadius
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stoppingY = 0
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while stoppingX >= stoppingY: # 1st set of points, y` > - 1
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sur.plot4EllipsePoints(cx, cy, x, y, col)
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inc(y)
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inc(stoppingY, twoASquare)
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inc(ellipseError, yChange)
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inc(yChange, twoASquare)
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if (2 * ellipseError + xChange) > 0 :
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dec(x)
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dec(stoppingX, twoBSquare)
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inc(ellipseError, xChange)
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inc(xChange, twoBSquare)
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# 1st point set is done; start the 2nd set of points
|
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x = 0
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y = yRadius
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||||
xChange = yRadius * yRadius
|
||||
yChange = xRadius * xRadius * (1 - 2 * yRadius)
|
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ellipseError = 0
|
||||
stoppingX = 0
|
||||
stoppingY = twoASquare * yRadius
|
||||
while stoppingX <= stoppingY:
|
||||
sur.plot4EllipsePoints(cx, cy, x, y, col)
|
||||
inc(x)
|
||||
inc(stoppingX, twoBSquare)
|
||||
inc(ellipseError, xChange)
|
||||
inc(xChange,twoBSquare)
|
||||
if (2 * ellipseError + yChange) > 0:
|
||||
dec(y)
|
||||
dec(stoppingY, twoASquare)
|
||||
inc(ellipseError, yChange)
|
||||
inc(yChange,twoASquare)
|
||||
|
||||
|
||||
proc plotAA(sur: PSurface, x, y: int, c: float, color: Color) =
|
||||
if (x > 0 and x < sur.s.w) and (y > 0 and y < sur.s.h):
|
||||
var video = cast[PPixels](sur.s.pixels)
|
||||
var pitch = sur.s.pitch.int div ColSize
|
||||
|
||||
var pixColor = getPix(video, pitch, x, y)
|
||||
|
||||
setPix(video, pitch, x, y,
|
||||
pixColor.intensity(1.0 - c) + color.intensity(c))
|
||||
|
||||
|
||||
template ipart(x: expr): expr = floor(x)
|
||||
template cround(x: expr): expr = ipart(x + 0.5)
|
||||
template fpart(x: expr): expr = x - ipart(x)
|
||||
template rfpart(x: expr): expr = 1.0 - fpart(x)
|
||||
|
||||
proc drawLineAA*(sur: PSurface, p1, p2: Point, color: Color) =
|
||||
## Draws a anti-aliased line from ``p1`` to ``p2``, using Xiaolin Wu's
|
||||
## line algorithm
|
||||
var (x1, x2, y1, y2) = (p1.x.toFloat(), p2.x.toFloat(),
|
||||
p1.y.toFloat(), p2.y.toFloat())
|
||||
var dx = x2 - x1
|
||||
var dy = y2 - y1
|
||||
|
||||
var ax = dx
|
||||
if ax < 0'f64:
|
||||
ax = 0'f64 - ax
|
||||
var ay = dy
|
||||
if ay < 0'f64:
|
||||
ay = 0'f64 - ay
|
||||
|
||||
if ax < ay:
|
||||
swap(x1, y1)
|
||||
swap(x2, y2)
|
||||
swap(dx, dy)
|
||||
|
||||
template doPlot(x, y: int, c: float, color: Color): stmt =
|
||||
if ax < ay:
|
||||
sur.plotAA(y, x, c, color)
|
||||
else:
|
||||
sur.plotAA(x, y, c, color)
|
||||
|
||||
if x2 < x1:
|
||||
swap(x1, x2)
|
||||
swap(y1, y2)
|
||||
|
||||
var gradient = dy / dx
|
||||
# handle first endpoint
|
||||
var xend = cround(x1)
|
||||
var yend = y1 + gradient * (xend - x1)
|
||||
var xgap = rfpart(x1 + 0.5)
|
||||
var xpxl1 = int(xend) # this will be used in the main loop
|
||||
var ypxl1 = int(ipart(yend))
|
||||
doPlot(xpxl1, ypxl1, rfpart(yend)*xgap, color)
|
||||
doPlot(xpxl1, ypxl1 + 1, fpart(yend)*xgap, color)
|
||||
var intery = yend + gradient # first y-intersection for the main loop
|
||||
|
||||
# handle second endpoint
|
||||
xend = cround(x2)
|
||||
yend = y2 + gradient * (xend - x2)
|
||||
xgap = fpart(x2 + 0.5)
|
||||
var xpxl2 = int(xend) # this will be used in the main loop
|
||||
var ypxl2 = int(ipart(yend))
|
||||
doPlot(xpxl2, ypxl2, rfpart(yend) * xgap, color)
|
||||
doPlot(xpxl2, ypxl2 + 1, fpart(yend) * xgap, color)
|
||||
|
||||
# main loop
|
||||
var x = xpxl1 + 1
|
||||
while x <= xpxl2-1:
|
||||
doPlot(x, int(ipart(intery)), rfpart(intery), color)
|
||||
doPlot(x, int(ipart(intery)) + 1, fpart(intery), color)
|
||||
intery = intery + gradient
|
||||
inc(x)
|
||||
|
||||
proc fillSurface*(sur: PSurface, color: Color) =
|
||||
## Fills the entire surface with ``color``.
|
||||
if sdl.fillRect(sur.s, nil, sur.createSdlColor(color)) == -1:
|
||||
raiseEGraphics()
|
||||
|
||||
template withEvents*(surf: PSurface, event: expr, actions: stmt): stmt {.
|
||||
immediate.} =
|
||||
## Simple template which creates an event loop. ``Event`` is the name of the
|
||||
## variable containing the Event object.
|
||||
while true:
|
||||
var event: sdl.Event
|
||||
if sdl.waitEvent(addr(event)) == 1:
|
||||
actions
|
||||
|
||||
if sdl.init(sdl.INIT_VIDEO) < 0: raiseEGraphics()
|
||||
if sdl_ttf.init() < 0: raiseEGraphics()
|
||||
|
||||
when not defined(testing) and isMainModule:
|
||||
var surf = newScreenSurface(800, 600)
|
||||
|
||||
surf.fillSurface(colWhite)
|
||||
|
||||
# Draw the shapes
|
||||
surf.drawLineAA((150, 170), (400, 471), colTan)
|
||||
surf.drawLine((100, 170), (400, 471), colRed)
|
||||
|
||||
surf.drawEllipse(200, 300, 200, 30, colSeaGreen)
|
||||
surf.drawHorLine(1, 300, 400, colViolet)
|
||||
# Check if the ellipse is the size it's suppose to be.
|
||||
surf.drawVerLine(200, 300 - 30 + 1, 60, colViolet) # ^^ | i suppose it is
|
||||
|
||||
surf.drawEllipse(400, 300, 300, 300, colOrange)
|
||||
surf.drawEllipse(5, 5, 5, 5, colGreen)
|
||||
|
||||
surf.drawHorLine(5, 5, 900, colRed)
|
||||
surf.drawVerLine(5, 60, 800, colRed)
|
||||
surf.drawCircle((600, 500), 60, colRed)
|
||||
|
||||
surf.fillRect((50, 50, 100, 100), colFuchsia)
|
||||
surf.fillRect((150, 50, 100, 100), colGreen)
|
||||
surf.drawRect((50, 150, 100, 100), colGreen)
|
||||
surf.drawRect((150, 150, 100, 100), colAqua)
|
||||
surf.drawRect((250, 150, 100, 100), colBlue)
|
||||
surf.drawHorLine(250, 150, 100, colRed)
|
||||
|
||||
surf.drawLineAA((592, 160), (592, 280), colPurple)
|
||||
|
||||
#surf.drawText((300, 300), "TEST", colMidnightBlue)
|
||||
#var textSize = textBounds("TEST")
|
||||
#surf.drawText((300, 300 + textSize.height), $textSize.width & ", " &
|
||||
# $textSize.height, colDarkGreen)
|
||||
|
||||
var mouseStartX = -1
|
||||
var mouseStartY = -1
|
||||
withEvents(surf, event):
|
||||
var eventp = addr(event)
|
||||
case event.kind:
|
||||
of sdl.QUITEV:
|
||||
break
|
||||
of sdl.KEYDOWN:
|
||||
var evk = sdl.evKeyboard(eventp)
|
||||
if evk.keysym.sym == sdl.K_LEFT:
|
||||
surf.drawHorLine(395, 300, 50, colBlack)
|
||||
echo("Drawing")
|
||||
elif evk.keysym.sym == sdl.K_ESCAPE:
|
||||
break
|
||||
else:
|
||||
echo(evk.keysym.sym)
|
||||
of sdl.MOUSEBUTTONDOWN:
|
||||
var mbd = sdl.evMouseButton(eventp)
|
||||
if mouseStartX == -1 or mouseStartY == -1:
|
||||
mouseStartX = int(mbd.x)
|
||||
mouseStartY = int(mbd.y)
|
||||
else:
|
||||
surf.drawLineAA((mouseStartX, mouseStartY), (int(mbd.x), int(mbd.y)), colPurple)
|
||||
mouseStartX = -1
|
||||
mouseStartY = -1
|
||||
|
||||
of sdl.MOUSEMOTION:
|
||||
var mm = sdl.evMouseMotion(eventp)
|
||||
if mouseStartX != -1 and mouseStartY != -1:
|
||||
surf.drawLineAA((mouseStartX, mouseStartY), (int(mm.x), int(mm.y)), colPurple)
|
||||
#echo(mm.x, " ", mm.y, " ", mm.yrel)
|
||||
|
||||
else:
|
||||
discard "echo(event.kind)"
|
||||
|
||||
sdl.updateRect(surf.s, 0, 0, 800, 600)
|
||||
|
||||
surf.writeToBMP("test.bmp")
|
||||
sdl.quit()
|
||||
Reference in New Issue
Block a user